Generator



FIG. 1 is a front view of a generator showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines showing are for illustrative purposes and form no part of the claimed design. 

The ornamental design for a generator, as shown and described. 